three.js/examples/js/nodes/core/AttributeNode.js

/**
 * @author sunag / http://www.sunag.com.br/
 */

THREE.AttributeNode = function ( name, type ) {

	THREE.GLNode.call( this, type );

	this.name = name;

};

THREE.AttributeNode.prototype = Object.create( THREE.GLNode.prototype );
THREE.AttributeNode.prototype.constructor = THREE.AttributeNode;
THREE.AttributeNode.prototype.nodeType = "Attribute";

THREE.AttributeNode.prototype.getAttributeType = function ( builder ) {

	return typeof this.type === 'number' ? builder.getConstructorFromLength( this.type ) : this.type;

};

THREE.AttributeNode.prototype.getType = function ( builder ) {

	var type = this.getAttributeType( builder );

	return builder.getTypeByFormat( type );

};

THREE.AttributeNode.prototype.generate = function ( builder, output ) {

	var type = this.getAttributeType( builder );

	var attribute = builder.material.getAttribute( this.name, type );

	return builder.format( builder.isShader( 'vertex' ) ? this.name : attribute.varying.name, this.getType( builder ), output );

};

THREE.AttributeNode.prototype.copy = function ( source ) {
			
	THREE.GLNode.prototype.copy.call( this, source );
	
	this.type = source.type;
	
};

THREE.AttributeNode.prototype.toJSON = function ( meta ) {

	var data = this.getJSONNode( meta );

	if ( ! data ) {

		data = this.createJSONNode( meta );

		data.type = this.type;

	}

	return data;

};